noun
defensive measures designed to destroy attacking enemy aircraft or missiles or to nullify their effectiveness (Freq. 1)
• Hypernyms: ↑defense, ↑defence, ↑defensive measure
• Hyponyms: ↑active air defense, ↑passive air defense
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noun : the means, techniques, and organizations devoted to preventing or minimizing the effects of attack by enemy aircraft or guided missiles
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air defense,
a system of defense against air attack, using aircraft, missiles, and other weapons, and electronic detection of attacking aircraft.
Useful english dictionary. 2012.